Learn a Fact: 1 x 9

1
3
x  1
2
1
x  9
3
0
x  6
4
6
x  1
5
3
x  0
6
1
x  7
7
2
x  0
8
4
x  1
9
1
x  5
10
4
x  0
11
0
x  8
12
0
x  1
13
2
x  1
14
7
x  0
15
5
x  0
16
1
x  1
17
0
x  9
18
8
x  1

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